Silicon Graphics InfiniteStorage 4000 Series System Upgrade Manual page 34

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Figure 11 Controller Air Blocker
11. Insert the controller air blocker into the open controller slot to make sure that the
correct airflow is maintained.
Figure 12 Inserting the Controller Air Blocker into the Open
Controller Slot
12. On each controller canister, press down on both of the top cover latch buttons,
and slide the top covers to the rear as shown in the following figure.